The outburst that the shield could endure might only be 5,000 points. Then, if the power outburst exceeded 5,000 points at some point, the shield would be ripped apart.
Almost all shields were like that. Thus, mages with powerful outbursts were generally stronger.
This set of magic tools was different in that its total capacity and its outburst capacity were the same. Its capacity might even change. The shield it provided would never be broken as long as there was still mana in the necklace.
The capacity depended on the mana in the necklace. If an attack instantly drained all the mana in the necklace, then the magic tools' protection would be broken. As long as the necklace contained mana, even a god wouldn't be able to break the shield. That being said, even Lin Yun was already capable of exhausting all the mana in the necklace at this moment.